Maybe for you.
When I play, it's
my game.
It is the DM's interpretation that matters, not the author's. But since we have no collective DM, we sit around and debate what would be reasonable rulings were these questions to come up in a game. Yes, the author's opinion and the FAQ (for whatever reason

) are given some weight in setting a standard, but they are never, ever the final call on a rules question.
The core books are the final word.
When they are interpretable, as they are in the
telekinesis spell, you have discussions like this one as to what should the spell be able to do.
Frankly, I think
Telekinesis is a great spell even without using it to Fling Skyward, but there is nothing in that spell to make me think that I couldn't use it to that effect. You can use it to make objects or creatures zing at something else. They will get a will save for that, and then the spell ends either way.
Because it's clearly within the rules to say "I fling him at the mosquito buzzing 30' above his head", I don't see how saying "fling him 30' up" makes any bit of a difference. You will have the exact same result. To rule otherwise is parsing, and will force PCs to begin targeting small particles in the air, which I think is silly.
To avoid that silliness, I would rule that you can create a Fling Skyward affect already, using the Violent Thrust option of that spell.